Automating Infrastructure on Google Cloud with Terraform: Challenge Lab

GSP345

Time: 1 hour 30 minutes

Cost: 5 Credits

Link: https://google.qwiklabs.com/quests/159?catalog_rank=%7B%22rank%22%3A1%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&search_id=10127304

Task 1. Create the configuration files

• Make the empty files and directories in Cloud Shell or the Cloud Shell Editor.
• Add the following to the each variables.tf file, and fill in the GCP Project ID:

variable "region" {
 default = "us-central1"
}

variable "zone" {
 default = "us-central1-a"
}

variable "project_id" {
 default = "<FILL IN PROJECT ID>"
}

Add the following to the main.tf file:

terraform {
  required_providers {
    google = {
      source = "hashicorp/google"
      version = "3.55.0"
    }
  }
}

provider "google" {
  project     = var.project_id
  region      = var.region

  zone        = var.zone
}


module "instances" {

  source     = "./modules/instances"

}

Run terraform init in Cloud Shell in the root directory to initialize terraform.

Task 2. Import infrastructure

Navigate to Compute Engine > VM Instances. Click on tf-instance-1. Copy the Instance ID down somewhere to use later. Navigate to Compute Engine > VM Instances. Click on tf-instance-2. Copy the Instance ID down somewhere to use later.

Next, navigate to modules/instances/instances.tf. Copy the following configuration into the file:

resource "google_compute_instance" "tf-instance-1" {
  name         = "tf-instance-1"
  machine_type = "n1-standard-1"
  zone         = var.zone

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

resource "google_compute_instance" "tf-instance-2" {
  name         = "tf-instance-2"
  machine_type = "n1-standard-1"
  zone         = var.zone

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

To import the first instance, use the following command, using the Instance ID for tf-instance-1 you copied down earlier.

terraform import module.instances.google_compute_instance.tf-instance-1 <INSTANCE-ID>

To import the second instance, use the following command, using the Instance ID for tf-instance-2 you copied down earlier.

terraform import module.instances.google_compute_instance.tf-instance-2 <INSTANCE-ID-2>

The two instances have now been imported into your terraform configuration. You can now optionally run the commands to update the state of Terraform. Type yes at the dialogue after you run the apply command to accept the state changes.

terraform plan
terraform apply

Task 3. Configure a remote backend

Add the following code to the modules/storage/storage.tf file:

resource "google_storage_bucket" "storage-bucket" {
  name          = var.project_id
  location      = "US"
  force_destroy = true
  uniform_bucket_level_access = true
}

Next, add the following to the main.tf file:

module "storage" {
  source     = "./modules/storage"
}

Run the following commands to initialize the module and create the storage bucket resource. Type yes at the dialogue after you run the apply command to accept the state changes.

terraform init
terraform apply

Next, update the main.tf file so that the terraform block looks like the following. Fill in your GCP Project ID for the bucket argument definition.

terraform {
  backend "gcs" {
    bucket  = "<FILL IN PROJECT ID>"
 prefix  = "terraform/state"
  }
  required_providers {
    google = {
      source = "hashicorp/google"
      version = "3.55.0"
    }
  }
}

Run the following to initialize the remote backend. Type yes at the prompt.

terraform init

Task 4. Modify and update infrastructure

Navigate to modules/instances/instance.tf. Replace the entire contents of the file with the following:

resource "google_compute_instance" "tf-instance-1" {
  name         = "tf-instance-1"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

resource "google_compute_instance" "tf-instance-2" {
  name         = "tf-instance-2"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

resource "google_compute_instance" "tf-instance-3" {
  name         = "tf-instance-3"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

Run the following commands to initialize the module and create/update the instance resources. Type yes at the dialogue after you run the apply command to accept the state changes.

terraform init
terraform apply

Task 5. Taint and destroy resources

Taint the tf-instance-3 resource by running the following command:

terraform taint module.instances.google_compute_instance.tf-instance-3

Run the following commands to apply the changes:

terraform init
terraform apply

Remove the tf-instance-3 resource from the instances.tf file. Delete the following code chunk from the file.

resource "google_compute_instance" "tf-instance-3" {
  name         = "tf-instance-3"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "default"
  }
}

Run the following commands to apply the changes. Type yes at the prompt.

terraform apply

Task 6. Use a module from the Registry

Copy and paste the following into the main.tf file:

module "vpc" {
    source  = "terraform-google-modules/network/google"
    version = "~> 2.5.0"

    project_id   = var.project_id
    network_name = "terraform-vpc"
    routing_mode = "GLOBAL"

    subnets = [
        {
            subnet_name           = "subnet-01"
            subnet_ip             = "10.10.10.0/24"
            subnet_region         = "us-central1"
        },
        {
            subnet_name           = "subnet-02"
            subnet_ip             = "10.10.20.0/24"
            subnet_region         = "us-central1"
            subnet_private_access = "true"
            subnet_flow_logs      = "true"
            description           = "This subnet has a description"
        }
    ]
}

Run the following commands to initialize the module and create the VPC. Type yes at the prompt.

terraform init
terraform apply

Navigate to modules/instances/instances.tf. Replace the entire contents of the file with the following:

resource "google_compute_instance" "tf-instance-1" {
  name         = "tf-instance-1"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "terraform-vpc"
    subnetwork = "subnet-01"
  }
}

resource "google_compute_instance" "tf-instance-2" {
  name         = "tf-instance-2"
  machine_type = "n1-standard-2"
  zone         = var.zone
  allow_stopping_for_update = true

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-10"
    }
  }

  network_interface {
 network = "terraform-vpc"
    subnetwork = "subnet-02"
  }
}

Run the following commands to initialize the module and update the instances. Type yes at the prompt.

terraform init
terraform apply

Task 7. Configure a firewall

Add the following resource to the main.tf file and fill in the GCP Project ID:

resource "google_compute_firewall" "tf-firewall" {
  name    = "tf-firewall"
 network = "projects/<PROJECT_ID>/global/networks/terraform-vpc"

  allow {
    protocol = "tcp"
    ports    = ["80"]
  }

  source_tags = ["web"]
  source_ranges = ["0.0.0.0/0"]
}

Congratulations!